These fit over the fill nipple and fit nice and snug. These wont fall off during play but don't expect that ring to keep it connected when you pull off the plug. Just pull the whole thing off when you fill and replace the whole thing when done. No problem. Buy a few just in case you lose one. These are great at keeping dirt out of your tank.

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0 of 0 people found the following review helpful:

does the job

March 1, 2015

Reviewer:
Dan
from VA

fits my ninja tank... great price

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0 of 0 people found the following review helpful:

Perfect

April 17, 2013

Reviewer:
Michael Lofthouse
from DeKalb, IL United States

Does what it says it does, no more, no less.

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1 of 1 people found the following review helpful:

Bets Fill Nipple Cover

September 2, 2011

Reviewer:
Michael G
from North Las Vegas, NV United States

I love it, I know it can be really easy to lose your fill nipple. Not anymore! It comes with a lanyard.

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0 of 0 people found the following review helpful:

awesome

April 4, 2011

Reviewer:
Stephen Brennan
from Yorktown Heights, NY United States

this thing does the same job as the metal ones you can get on the market, plus its cheap. never comes off, it attaches to the nipple so you won't lose it. don't waste money on one of the metal one's when you can get this.